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| 型号： | ADUC7033BSTZ-88-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 119/140页 |
| 文件大小： | 0K |
| 描述： | IC BATT SENSOR PREC 48LQFP |
| 标准包装： | 2,000 |
| 功能： | 电池监控器 |
| 电源电压： | 3.5 V ~ 18 V |
| 工作温度： | -40°C ~ 115°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 带卷 (TR) |
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ADuC7033
Table 91. STICON MMR Bit Designations
Bit
16 to 9
8 to 5
4 to 2
1
0
Description
Reserved. These bits are reserved for future use and should be written as 0 by user code.
State Bits, Read Only. If the interface is in the middle of a transmission, these bits are not 0.
Number of Bytes to Transmit. These bits select the number of bytes to be transmitted. User code must subsequently
write the bytes to be transmitted into the STIDAT0, STIDAT1, and STIDAT2 MMRs.
000 = 1-byte transmission.
001 = 2-byte transmission.
010 = 3-byte transmission.
011 = 4-byte transmission.
100 = 5-byte transmission.
101 = 6-byte transmission.
Reset Serial Test Interface.
Set to 1 to reset the serial test interface; a subsequent read of STICON returns all 0s.
This bit is 0 by default to operate in normal mode.
Serial Test Interface Enable.
Set to 1 by user code to enable the serial test interface.
Set to 0 by user code to disable the serial test interface.
Serial Test Interface Output Structure
The serial test interface is a high voltage output that
incorporates a low-side driver, short-circuit protection, and
diagnostic pin readback capability. The output driver circuit
For example, if the ADC is sampling at 1 kHz, then the baud
rate has to be sufficient to output 36 bits as follows:
(3 × 8 bits (16-bit ADC result and a checksum byte, for
example)) + (3 × 1 start bit) + (3 × 1 parity bit) +
(3 × 2 stop bits) = 36 bits
PIN
READBACK
HVMON[5]
STI
TRANSMIT
GP2CON[24]
REF1
STI
Therefore, the serial test interface must transmit data at greater
than 36 kbps. The closest standard baud rate is 38.4 kbps; as
such, the reload value written to the Timer4 load MMR (T4LD)
is 0x0106 (267 decimal). This value is calculated as follows, and
is based on a prescaler of 1, using a core clock of 10.24 MHz:
T4LD =
Core Clock Frequency
Desired Baud Rate
=
10 . 24 MHz
38 . 4 kbps
= 267
SHORT-CIRCUIT
PROTECTION CONTROL
HVCFG1[2]
Figure 44. STI Output Structure
Using the Serial Test Interface
Data only begins transmission when configuration of the STI
port has been completed in the following sequence:
When the Timer4 load value is written and the timer itself
is configured and enabled using the T4CON MMR, the STI
port must be configured. This is accomplished by writing to the
STICON MMR in a specific sequence using the STIKEY0 and
STIKEY1 MMRs as previously described throughout the Serial
1.
2.
3.
Configure Timer4 for baud rate generation.
Correctly enable STICON using STIKEY0 and STIKEY1
for secure access.
Required bytes to be transmitted are written into
STIDAT0, STIDAT1, and STIDAT2.
Finally, the STI port does not begin transmission until the
required number of transmit bytes are written into the
STIDATx MMRs. As soon as STI starts transmitting, the
value in the STICON MMR changes from the value initially
written to this register. User code can ensure that all data is
transmitted by continuously polling the STICON MMR until
Timer4 is configured with the correct load value to generate an
overflow at the required baud rate. If the STI port is being used
it reverts back to the value originally written to it. To disable
the serial interface, user code must write a 0 to STICON[0].
to transmit ADC conversion results, the baud rate must be
sufficient to output each ADC result (16-bits) prior to the next
ADC conversion result being available.
Rev. B | Page 119 of 140
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